Details

Autor(en) / Beteiligte

• Mair, Christian
• Warwitz, Boris
• Fink, Katharina
• Scarpa, Lorenza
• Nilica, Bernhard
• Maffey-Steffan, Johanna
• Buxbaum, Sabine
• Virgolini, Irene J.

Titel

Radiation exposure after 177Lu-DOTATATE and 177Lu-PSMA-617 therapy

Ist Teil von

• Annals of nuclear medicine, 2018-08, Vol.32 (7), p.499-502

Ort / Verlag

Tokyo: Springer Japan

Erscheinungsjahr

2018

Link zum Volltext

Quelle

SpringerLink

Beschreibungen/Notizen

• Purpose As radionuclide therapy is gaining importance in palliative treatment of patients suffering from neuroendocrine tumour (NET) as well as castration resistant prostate cancer (CRPC), the radiation protection of patients, staff, family members and the general public is of increasing interest. Here, we determine patient discharge dates according to European guidelines. Methods In 40 patients with NET and 25 patients with CRPC organ and tumour doses based on the MIRD concept were calculated from data obtained during the first therapy cycle. Planar whole body images were recorded at 0.5, 4, 20, 68 und 92 h postinjection. Residence times were calculated from the respective time-activity-curves based on the conjugated view method. Residence times for critical organs were fitted into the commercially available OLINDA software to calculate the organ doses. The doses of tumours and salivary glands were calculated via their self-irradiation by approximation with spheres of equivalent volume. Kidney volumes were gained by organ segmentation, volumes of all other organs were estimated by means of OLINDA and hence were lean body mass corrected. Out of the whole body curves reference points for patient discharge were estimated. Results In patients with NET discharge dates could be properly estimated from dosimetric data, which is not only crucial for radiation protection, but also makes therapy planning easier. For 177 Lu-PSMA-617 ligand therapy it is difficult to seriously estimate a generalized discharge date due to large interpatient variation resulting from different tumor loads and heavy pre-treatment. Conclusion Patient release is predictable for 177 Lu-DOTATATE therapy but not for 177 Lu-PSMA ligand therapy.